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What is FOD2742C?

This electronic component, produced by the manufacturer "Fairchild Semiconductor", performs the same function as "OPTICALLY ISOLATED ERROR AMPLIFIER".


FOD2742C Datasheet PDF - Fairchild Semiconductor

Part Number FOD2742C
Description OPTICALLY ISOLATED ERROR AMPLIFIER
Manufacturers Fairchild Semiconductor 
Logo Fairchild Semiconductor Logo 


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OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2742A
FOD2742B
FOD2742C
DESCRIPTION
The FOD2742 Optically Isolated Amplifier consists of the popular KA431 precision
programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide
(GaAs) light emitting diode optically coupled to a silicon phototransistor. It comes in 3
grades of reference voltage tolerance = 2%, 1%, and 0.5%.
The Current Transfer Ratio (CTR) ranges from 100% to 200%. It also has an outstanding
temperature coefficient of 50 ppm/°C. It is primarily intended for use as the error amplifier/
reference voltage/optocoupler function in isolated ac to dc power supplies and dc/dc con-
verters.
When using the FOD2742, power supply designers can reduce the component count and
save space in tightly packaged designs. The tight tolerance reference eliminates the need
for adjustments in many applications. The device comes in a 8-pin small outline package.
FEATURES
• Optocoupler, precision reference and error amplifier in single package
• 2.5V reference
• CTR 100% to 200%
• 2,500V RMS isolation
• UL approval E90700, Volume 2 • BSI approval 8661, 8662
• VDE approval 136616
• CSA approval 1113643
• Low temperature coefficient 50 ppm/°C max
• FOD2742A: tolerance 0.5%
FOD2742B: tolerance 1%
FOD2742C: tolerance 2%
APPLICATIONS
• Power supplies regulation
• DC to DC converters
FUNCTIONAL BLOCK DIAGRAM
NC 1
C2
E3
NC 4
8 LED
7 FB
6 COMP
5 GND
PIN DEFINITIONS
Pin Number
1
2
3
4
5
6
7
8
Pin Name
NC
C
E
NC
GND
COMP
FB
LED
Pin function description
Not connected
Phototransistor Collector
Phototransistor Emitter
Not connected
Ground
Error Amplifier Compensation. This pin is the output of the error amplifier. *
Voltage Feedback. This pin is the inverting input to the error amplifier
Anode LED. This pin is the input to the light emitting diode.
* The compensation network must be attached between pins 6 and 7.
© 2003 Fairchild Semiconductor Corporation
Page 1 of 13
8/27/03

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FOD2742C equivalent
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2742A
FOD2742B
FOD2742C
I(LED)
8
VF
6
V7
VREF
5
2
3
V
I(LED)
8
2
R1 6
7
R2 VREF
5
VCOMP
3
FIG. 1. VREF, VF, ILED (min) TEST CIRCUIT
FIG. 2. VREF/VCOMP TEST CIRCUIT
I(LED)
8
IREF
6
V7
R1
5
2
3
FIG. 3. IREF TEST CIRCUIT
ICEO
82
VCE
6
3
7
5
I(OFF)
V(LED)
V
8
6
7
5
2
3
FIG. 4. I(OFF) TEST CIRCUIT
I(LED)
V
8
6
7
VREF
5
I(C)
2
VCE
3
VCOMP
FIG. 5. ICEO TEST CIRCUIT
© 2003 Fairchild Semiconductor Corporation
Page 5 of 13
FIG. 6. CTR, VCE(sat) TEST CIRCUIT
8/27/03


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for FOD2742C electronic component.


Information Total 13 Pages
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Featured Datasheets

Part NumberDescriptionMFRS
FOD2742AThe function is OPTICALLY ISOLATED ERROR AMPLIFIER. Fairchild SemiconductorFairchild Semiconductor
FOD2742BThe function is OPTICALLY ISOLATED ERROR AMPLIFIER. Fairchild SemiconductorFairchild Semiconductor
FOD2742CThe function is OPTICALLY ISOLATED ERROR AMPLIFIER. Fairchild SemiconductorFairchild Semiconductor

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